Piston-driven oil pump mechanism

ABSTRACT

A piston-driven oil pump mechanism constructed to simplify structure and reduce parts for increased compression efficiency but drastically reduced generating of noise, the mechanism comprising: an oil pump cylinder additionally mounted at one side of a cylinder block formed with a cylinder where a piston is reciprocally driven by explosion in a combustion chamber; an oil pump piston reciprocally driven in the oil pump cylinder by a crank shaft where reciprocal motion of the piston is changed rotary motion; an oil drainage outlet so formed to communicate with an oil gallery above the oil pump cylinder; an oil suction inlet formed adjacent to the oil outlet above the oil pump cylinder for connection to an oil pan; and oil suction and oil drainage valves openably and closeably actuated by a valve train for opening the oil suction inlet when the oil pump cylinder is downwardly actuated to block the oil drainage outlet and for closing the oil suction inlet when the oil pump cylinder is upwardly actuated to open the oil drainage outlet.

BACKGROUND OF THE INVENTION

[0001] 1. Field of the Invention

[0002] The present invention relates to a piston-driven oil pump mechanism.

[0003] 2. Description of the Prior Art

[0004] Lubrication in an engine has an important meaning in that it serves to decrease heat and frictional resistance in the engine.

[0005] In order to decrease the heat and frictional resistance in the engine oil is infused into the engine. There are a couple of ways of lubrication methods in an engine such as forced injection by oil pump and splash of principal motion parts, however generally wet pump method is used where engine oil is collected at an oil pan underneath the engine to drive an oil pump and to be sent to major parts of the engine.

[0006] The oil pump is generally used to forcibly send engine oil to crank shaft, cam shaft bearing and the like, and is directly driven by the crank shaft or indirectly driven by gear, chain, toothed lock belt and the like. There are trochoid type, gear type, vane tape and like, however, trochoid type comprising inner rotor and outer rotor is usually utilized.

[0007] An oil pump according to the prior art is assembled in order of an installation space 21 at a side of a cylinder block 20, an oil pump cover 22, inner and outer rotors 23 and 24 and front case 25, as illustrated in FIGS. 3 and 4.

[0008] When the inner rotor 23 is coupled to a front part of the crank shaft 26 for driving, bulged teeth 23 a of the inner rotor 23 are sequentially meshed into recessed grooves 24 a of the outer rotor 24 to generate a change of voluminal spaced because center of the inner rotor 23 (inside rotor) is eccentrically located from center of the outer rotor 24, such that oil sucked through a pump suction inlet 27 is compressed to be forcibly sent to various parts of the engine via pump outlet 28.

[0009] However, there is a problem in the rotor structure thus described in that, whenever the crank shaft is rotated, contact occurs as many as the number of teeth at the inner rotor 23 to thereby generate noise, where the noise is increased as the engine is increased in speed thereof, which covers the lion's share of engine noises.

[0010] There is another problem in that the conventional oil pump should be assembled with many parts, resulting in complication in structure thereof.

SUMMARY OF THE INVENTION

[0011] The present invention is disclosed to solve the aforementioned problems and it is an object of the present invention to provide a piston-driven oil pump mechanism constructed to simplify structure and reduce parts for increased compression efficiency but drastically reduced generation of noise.

[0012] In accordance with the object of the present invention, there is provided a piston-driven oil pump mechanism, the mechanism comprising:

[0013] an oil pump cylinder additionally mounted at one side of a cylinder block formed with a cylinder where a piston is reciprocally driven by explosion in a combustion chamber;

[0014] an oil pump piston reciprocally driven in the oil pump cylinder by a crank shaft where reciprocal motion of the piston is changed rotary motion;

[0015] an oil drainage outlet so formed to communicate with an oil gallery above the oil pump cylinder;

[0016] an oil suction inlet formed adjacent to the oil outlet above the oil pump cylinder for connection to an oil pump; and

[0017] oil suction and oil drainage valves openably and closeably actuated by a valve train for opening the oil suction inlet when the oil pump cylinder is downwardly actuated to block the oil drainage outlet and for closing the oil suction inlet when the oil pump cylinder is upwardly actuated to open the oil drainage outlet.

BRIEF DESCRIPTION OF THE DRAWINGS

[0018] For fuller understanding of the nature and objects of the invention, reference should be made to the following detailed description taken in conjunction with the accompanying drawings in which:

[0019]FIG. 1 is a schematic diagram for illustrating a piston-driven oil pump mechanism according to the present invention;

[0020]FIG. 2 is a schematic diagram for illustrating an oil suction and drainage valves according to the present invention; and

[0021]FIGS. 3 and 4 are schematic diagrams for illustrating the prior art.

DETAILED DESCRIPTION OF THE INVENTION

[0022] Structure and operation of the present invention will now be described in detail with reference to the accompanying drawings.

[0023]FIG. 1 is a schematic drawing for illustrating a piston-driven oil pump mechanism according to the present invention, where a cylinder block 10 (hereinafter a concept including a cylinder head) is sequentially arranged with four cylinders 1, 2, 3 and 4 in case of a four cylinder engine, and an oil pump cylinder 5 is additionally formed next to the first cylinder 1 or the fourth cylinder 4.

[0024] The oil pump cylinder 5 is installed therein with an oil pump piston 6 for reciprocated driving where the oil pump piston 6 is connected to a crank shaft 8 via a connecting rod 7. The oil pump cylinder 5 is formed thereon with an oil suction inlet 9 and an oil drainage outlet 11, which are respectively opened and closed by an oil suction valve 12 and an oil drainage valve 13.

[0025] Furthermore, the oil suction valve 12 and the oil drainage valve 13 are respectively opened and closed by a valve train 14 (suction/exhaust valve actuating mechanism) for respectively opening and closing each combustion cylinder 1, 2, 3 and 4.

[0026] Now, oil supply procedures of the present invention thus described will be explained.

[0027] When cylinders 1, 2, 3 and 4 are sequentially exploded, the crank shaft 8 obtains a rotating power and the oil pump piston 6 connected to the crank shaft 8 is reciprocally driven up and clown along an inner wall surface of the oil pump cylinder 5. When the oil pump piston 6 descends from an upper dead center, the oil suction valve 12 serves to open the oil suction inlet 9 according to the valve train 14 such as cam shaft or the like while the oil drainage valve 13 blocks the oil drainage outlet 11.

[0028] Successively, the oil in the oil pan is sucked into the oil pump cylinder 5 because a negative pressure is formed in the oil pump cylinder 5, whereas the oil pump piston 6 is reversed, such that the oil suction valve 12 blocks the oil suction inlet 9 and the oil exhaust valve 13 opens the oil drainage outlet 11.

[0029] When the oil pump piston 6 is raised, engine oil filled in the oil pump cylinder 5 receives a compression force to be forcibly sent to the oil gallery 15 through the opened oil drainage outlet 11 for supply to various moving parts in the engine.

[0030] At this location, it should be noted that valve seats 18 and 19 may be formed at the oil suction inlet 9 and the oil drainage outlet 11 and plate valves 16 and 17 for opening and closing by being adhered to and detached from the valve seats 18 and 19 may be mounted to construct a simple suction and drainage of oil as illustrated in FIG. 2, instead of the oil suction and exhaust valves 12 and 12 actuated by the valve train 14.

[0031] As apparent from the foregoing, there is an advantage in the piston-driven oil pump mechanism thus constructed according to the present invention in that a cylinder block is additionally formed next to a cylinder for obtaining a power of an oil pump cylinder, and an oil pump cylinder is mounted for an engine oil piston to communicate with a creak shaft, thereby simplifying structure of oil pump and reducing generating of noise. 

What is claimed is:
 1. A piston-driven oil pump mechanism, the mechanism comprising: an oil pump cylinder additionally mounted at one side of a cylinder block formed with a cylinder where a piston is reciprocally driven by explosion on a combustion chamber; an oil pump piston reciprocally driven in the oil pump cylinder by a crank shaft where reciprocal motion of the piston is changed rotary motion; an oil drainage outlet so formed to communicate with an oil gallery above the oil pump cylinder; an oil suction inlet formed adjacent to the oil outlet above the oil pump cylinder for connection to an oil pan; and oil suction and oil drainage valves openably and closeably actuated by a valve train for opening the oil suction inlet when the oil pump cylinder is downwardly actuated to block the oil drainage outlet and for closing the oil suction inlet when the oil pump cylinder is upwardly actuated to open the oil drainage outlet.
 2. A piston-driven oil pump mechanism, the mechanism comprising: an oil pump cylinder additionally mounted at one side of a cylinder block formed with a cylinder where a piston is reciprocally driven by explosion in a combustion chamber; an oil pump piston reciprocally driven in the oil pump cylinder by a crank shaft where reciprocal motion of the piston is changed rotary motion; an oil drainage outlet so formed to communicate with an oil gallery above the oil pump cylinder; an oil suction inlet formed adjacent to the oil outlet above the oil pump cylinder for connection to an oil pan; and oil suction/exhaust plate valves rotatively actuated for opening an oil suction inlet by being detached from a valve set portion of the oil suction inlet when the oil pump cylinder is downwardly activated and for being adhered to the valve seat portion of an oil drainage outlet to block the oil drainage outlet, and for closing the oil suction inlet by being adhered to the valve seat portion when the oil pump cylinder is upwardly actuated and for opening the oil drainage outlet by being detached from valve seat portion of the oil drainage outlet. 